Men's size can vary widely, and each has its own characteristics and therefore have different sleeping position is also taken for granted. Can you adapt to different positions, but the mattress? skills will make people sleep only if the mattress back and hips both support the weight, is too soft will cause most of the back and hips sinking, in order to overcome the lack of mattresses can lead to unnatural sleeping positions. If you have to wake up in the middle of the frequent, woke up hands and feet go numb, and low neck pain and other symptoms after you get up, you have to check your mattress problem. The ideal sleeping position, what is the ideal sleeping position? summed up in a Word is "normal standing posture of the State lying on the bed". Sleep to maintain normal standing posture, naturally curved "s" shape does not pose a burden to the spine and the body, an important condition for good and go to sleep. When lying on your side is not consciously "く" glyph and curled naturally straight is the best.